Pin-driving tool

ABSTRACT

A pin-driving tool actuated by explosive forces is shown. The tool includes a housing having an explosive chamber therewithin, pin support means operatively connected with said explosive chamber, and a cartridge selectively contained within said explosive chamber. A connecting cylinder is mounted upon the housing and contains an actuating lever therewithin which, by movement of the handle, controls a control lever. The control lever in turn abuts a forwardly biased spring-loaded ram which, in turn is adapted to strike a firing pin. A safety hook is provided which prevents the control lever from moving if the probe to which it is connected projects from the tool and the tool is not in abutting relationship with work.

United States Patent Endo et al.

[ Feb. 22, 1972 [541 PIN-DRIVING TOOL [72] Inventors: Kumaii Endo; Fumlo Eblsawa; Masao Murata'ni, all of Yokohama-shi, Japan [73] Assignee: Japan Drive-1t Co., Ltd., Tokyo, Japan [22] Filed: Dec. 16, 1969 211 Appl. No.: 885,528

[52] US. Cl..... ...227/8, 227/10 [51] Int. Cl ..B25c 1/14 [58] Field of Search ..227/8, 9, 1O

[56] References Cited UNITED STATES PATENTS Re.23,569 10/1952 Sopris ..227/9 2,632,890 3/1953 Tietig ....227/10 2,970,314 2/1961 Temple et al. ..227/8 3,032,768 5/1962 Lamoureux ..227/8 3 ,275,209 9/1966 Hansen ..227/ 10 Bayer et al ..227/10 Jackson et a1. ..227/10 [5 7] ABSTRACT A pindriving tool actuated by explosive forces is shown. The tool includes a housing having an explosive chamber therewithin, pin support means operatively connected with said explosive chamber, and a cartridge selectively contained within said explosive chamber. A connecting cylinder is mounted upon the housing and contains an actuating lever therewithin which, by movement of the handle, controls a control lever. The control lever in turn abuts a forwardly biased spring-loaded ram which, in turn is adapted to strike a firing pin. A safety hook is provided which prevents the control lever from moving if the probe to which it is connected projects from the tool and the tool is not in abutting relationship with work.

3 Claims, 4 Drawing Figures PATENTEBFEB 22 m SHEET 1 or 3 H IIJ mi i l m 44 F u "0 350 W a In "1 FIG! I e I6 l3 I3al40 2 I4 40 ATTORNEY PATENTEDFEBZZ I972 3, 643 8 5O sum 2 OF 3 FIG.4

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lb 20 40 la 1 N VEN TORS [rum AJI E/VDO A TTQRNEY PIN-DRIVING TOOL The present invention relates to pin-driving tools, conventional pin-driving tools for driving a pin or a stud into a relatively hard material by means of the explosive power of powders. These devices are usually operated by pulling a trigger or striking a hammer at a firing unit in a barrel housing within a tool body containing the barrel housing and adjacent firing unit which is held in the hands with an end of the tool thrust against an object. In order to securely drive the pin into a predetermined position the operator is required to occupy a driving position suitable for operation in a most natural and stable manner. It is difficult or hardly possible however to ensure said safe and stable operation within a narrow place such as within a cylindrical housing or the like. In case wherein a pin is driven into an object material situated substantially higher or lower than the operator it is necessary to provide a footing for the operator at each driving operation resulting in not only the consumption of time and labor but the obstruction of a smooth operation.

This invention has been developed to eliminate the disadvantages of conventional pin-driving tools.

The pin-driving tool according to the invention generally consists of a barrel housing, a firing unit, and a handle having a trigger at the top of a cylinder mounted uprightly on said tool body. With the tool of such construction the operator will set the tool body at a predetermined location and turn the handle through a connected cylinder from a remote place and effect a complete driving operation. The driving tool of the present invention is specifically provided with a firing unit which will not fire readily when the tool is charged with powder and the pin armed contrary to the will of the operator. The device is further provided with a safety means that will prevent the operator from pulling a trigger unless the end of the tool is pressed against the surface of the material into which the pin is driven by the operator.

By use of the pin-driving tool of the invention therefore it is possible for the operator to effecta trigger operation from a remote place by means of the connecting cylinder so that he may safely and securely operate the driving tool at a predetermined place remote from the material in a most natural and stable way even with operation inside of a cylinder housing or a narrow place with or without aid of a prearranged footing. The pin-driving tool of the invention thus enables the operator to strike the firing unit with a trigger without use of a hammer and the like. It is so designed that the operator can perform the driving operation solely by his own hands without need of surplus operators in a safe and stable manner.

The invention will now be illustrated through an embodiment with reference to the accompanying drawings. In order that this invention may be more readily understood, reference will now be made, by way of example, to the accompanying drawing in which:

FIG. 1 is a vertical sectional view of a pin-driving tool according to the present invention.

FIGS. 2 and 3 are fragmentary sectional plan views of the driving tool.

FIG. 4 is a fragmentary side elevational view of the tool being collapsed.

FIG. 5 is a vertical sectional elevational view of an essential part of another embodiment of the pin-driving tool according to the present invention.

In the driving tool as shown, a barrel 1 is enclosed in a tool housing 2, provided with an action housing 5 fitted slidably to said barrel 1 to move in the axial direction thereof and carrying a breech block 4 rotatably mounted on a frame 3 of the firing unit (FIGS. 1 and 2). A powder chamber 6 is formed in the rear part of the barrel housing 1 and located opposite to a firing pin 7 in the breech block 4. When the end of the barrel is closed by the breech block 4, a portion 4a of said breech block is engaged to a portion la of the barrel 1 (FIG. 2). The engagement of the portion 4a to the portion 1a is released by a turn of the breech block 4. A guide screw 8 fixed to the action housing 5 is slidably engaged in an elongated slot 2a on the housing 2 and a guide groove lb on'the barrel 1. The action housing 5 may be retracted (FIG. 3) and rotated around the guide screw 8 (FIG. 4). When the breech block 4 is retracted rearwardly relative to the barrel 1 an ejector 9 is pulled rear wardly to eject a cartridge out of the powder chamber 6.

A head 13a of the pin 13 provided with a washer 12 inserted from an adapted 11 screwed into the housing 2 is fitted to a notch 14a of a piston 14 which is movable in the axial direction in the barrel housing 1. At the forward end of the barrel housing 1 a barrel nut 16 is screwed into place and is fitted with a magnet 15 in order to magnetically hold the washer 12 in place and to maintain the pin 13 in the barrel 1. A cover 17 provided on the housing 2 at the top is provided with a hook 21 pivotally mounted on a shaft 22, said hook 21 being connected to a lever release shaft 19 by a pin 20, said shaft 19 being axially movably housed to the cover at the front through a compression spring 18. One end of the lever 27 is revolvably attached on controller shaft 26 and adapted to be engaged by a spring 28 to a member 2511 of a trigger bar 25 having a spring 24 in the upright connected cylinder 23 on the housing 2 and is passed through a notch 23a of the connected cylinder 23. The other end of the lever 27 is provided with a spring 29. A projecting end of a toggle 31 which is revolvable about shaft 30 is engaged with an inclined surface 340 of a ram 34 by action of a spring 33, said ram 34 being pivotally mounted to'the frame 3 by a shaft 32. When the engagement of the toggle 31 and the inclined surface 34a is released the driving surface 34b of the ram 34 strikesat the firing pin 7 by the propelling force of the spring 33. At the end of the barrel an ejector 9 is provided which is movable in the axial direction, having an inner edge of said end engated with the edge of the cartridge 10 and a projection 9a contacting with the guide screw 8.

A handle 35 consists of holder 350 secured by a screw 37 to a base 36 attached to the connecting cylinder 23 and an operation part 35b fitted in a guide 38 inside the holder 35a, and the trigger bar 25 is fitted to the base 36, and inserted through a controlling unit 39 attached to the connecting cylinder 23. The controlling unit 39 and the base 36 are secured to the ends of a coil'spring 40. A guide groove 36a is provided in the peripheral direction of the-base 36 and a projection 39a-on the controlling unit 39 is engaged to the guide groove 360. At the lower end of the controlling unit 39 there is provided a longitudinal slot 3% and the projection 25b on the trigger bar 25 is fitted in said longitudinal slot 39b. The base 36 can be divided into upper and lower portions and assembled together with a screw 41. Grasping the handle 35 in one hand and a connecting cylinder in the other hand the barrel end is pressed against the driving surface W. The operator will disengage the book 21 from the lever 27 and turn the handle 35 against the coil spring 40, whereupon the projection 39a hits at the opposite end of the guide groove 360 while at the same time the projection 25b is moved below the longitudinal groove 39bso as to raisethe operation part 35b against the force of the spring 24. At that time the trigger bar 25 in connection with the operation part 35b tumsthelever 27 about the-shaft26.

The tool operates as follows:

The frame 3 is turned about an axis of the barrel 1. The engagement of the portion 4a of the breech block 4 integrated with the frame and the portion 1a of the barrel 1 is released. The frame 3 is pulled rearwardly and rotated and the end of the barrel 1 provided with thepowder chamber 6 is exposed (FIG. 4). The powder chamber may be loaded with a cartridge '10 and the barrel 1 and the breech block 4 are set back to the initial position, whereby the engaging portions la and 4a.are engaged at the end and the powder chamber 6 is closed. with the breech block 4.

The pin 13 provided with thewasher 12 is inserted from the barrel end, the head of said pin being fitted into the-notch at the-forward end of the piston 14. The magnet 15 of the barrel nut screwed into the forward end of the barrel attractsthe washer 12 and retains. the pin 13 in'the barrel 1.-By insertion of the pin 13 into thebarrel 1 the piston 14 which is for-wardly driven by driving is pulled back to a rear position (FIG. 1) in the barrel prior to the driving operation.

When the forward end of the adapter 11 is pressed against the driving surface W, the lever release shaft 19 moves slidably rearwardly against the force of the spring 18 permitting the hook 21 connected by the pin to rotate in the counterclockwise direction about the shaft 22.

As the trigger bar 25 is raised against the action of the spring 24, the lever 27 turns clockwise about the shaft 26 and the end of the toggle 31 at the right end portion of the lever 27 contacts with the inclined surface 34a of the ram 34. By a further turn of the lever 27 the toggle 31 revolves the ram 34 about the shaft 32 against the force of the spring 33. By further turning of the lever 27 the toggle 31 is disengaged from the inclined surface 34a of the ram 34. The ram 34 is revolved impulsively by the repelling force of the spring 33 and its driving surface 34b strikes at the firing pin 7. By this operation the firing pin 7 is driven in the forward direction, the forward end of which hits at the bottom of the cartridge in the powder chamber 6 and fires the cartridge 10. The piston 14 in the barrel 1 is driven in the forward direction by gas pressure produced from the firing of the cartridge 10 to drive the pin 13 into the surface W.

When the raising force of the trigger bar 25 is reduced the trigger bar 25 comes down by action of the spring 24, the lever 27 being turned counterclockwise about the shaft 26 by push of the spring 28. At the instant the inclined surface of the toggle 31 contacts with the forward end of the ram 34, the toggle 31 being turned clockwise about the shaft against the spring 29. As the lever 27 turns counterclockwise the forward end of the toggle 31 runs over the forward end of the ram 34, the toggle 31 being turned counterclockwise, about the shaft 30 by action of the spring 29 and returns to the initial position.

As the tool is taken off the driving surface W, the lever release shaft 19 is pushed forwardly by action of the spring 18 so that the hook 21 connected thereto is turned counterclockwise about the shaft 22 and the jaw at the upper end of the hook 21 moves to a position in which it engages with the projection at the forward end of the lever 27. In this position the clockwise revolution of the lever 27 is prevented and the operation of the firing unit is prevented.

By rearward movement of the breech block 4, action housing 5, etc., relative to the barrel 1 where the tool is released from its operation, the guide screw 8 enters into contact with the projection 9a of the ejector 9. Thus, the exhausted cartridge is unloaded from the powder chamber 6 (FIG. 3).

FIG. 5 shows an embodiment in which a power plug 42 is inserted into a barrel from an end thereof, said power plug 42 being integrated with a powder chamber which contains a cartridge at the rear end of a cylinder slidably housing a piston in the axial direction for driving a pin by explosive force of powder.

According to this embodiment, the end of the barrel is opened by the same operation as described above, the power plug 42 and the piston 43 frictionally carried therein are drawn from the barrel housing together. Then the pin to be driven is dropped at the end thereof into the barrel. The power plug 42 and the piston 43 are inserted into the barrel. The pin is therefore held in the barrel in a position in which the rear end of the pin contacts with the forward end of the piston 43. Thereafter a cartridge is loaded in the powder chamber at the rear end of the power plug 42 and the latter is closed. When the piston 42 which has been moved in the forward position in the power plug for driving a pin is moved back to a rearward position, the projecting rod at the exhausted cartridge tube outwardly of the powder chamber and serves as an ejector.

Many variations may be effected without departing from the spirit of my invention. It is to be understood that these, together with other variations in details, are anticipated by the appended claims.

1. A pin-driving tool actuated by explosive forces comprising a housing, a connecting cylinder mounted on said housing,

first actuating means within said connecting c linder, a handle connected to said actuating means, pivotal y movable controlling means also connected to said actuating means, firing pin means within said housing, a pivotally movable forwardly spring-biased ram member connected to said controlling means, said controlling means comprising a pivoted lever having one end actuatable with said ram; a safety probe normally outwardly biased within said housing, and hook means pivotally connected to said probe and adapted to retain one end of said lever against pivotal movement when said probe is in outwardly biased position.

2. A pin-driving tool as described in claim 1 including pin support means within said housing and magnet means operatively connected with said pin support means to retain said pin in position within said housing.

3. A pin-driving tool as described in claim 2 including an explosive-containing chamber, a cartridge within said explosivecontaining chamber, and means for conducting the explosive force produced by explosion of said cartridge against the pin contained within said housing to drive the same. 

1. A pin-driving tool actuated by explosive forces comprising a housing, a connecting cylinder mounted on said housing, first actuating means within said connecting cylinder, a handle connected to said actuating means, pivotally movable controlling means also connected to said actuating means, firing pin means within said housing, a pivotally movable forwardly spring-biased ram member connected to said controlling means, said controlling means comprising a pivoted lever having one end actuatable with said ram; a safety probe normally outwardly biased within said housing, and hook means pivotally connected to said probe and adapted to retain one end of said lever against pivotal movement when said probe is in outwardly biased position.
 2. A pin-driving tool as described in claim 1 including pin support means within said housing and magnet means operatively connected with said pin support means to retain said pin in position within said housing.
 3. A pin-driving tool as described in claim 2 including an explosive-containing chamber, a cartridge within said explosive-containing chamber, and means for conducting the explosive force produced by explosion of said cartridge against the pin contained within said housing to drive the same. 